package org.apache.maven.lifecycle.internal;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.maven.project.MavenProject;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @since 3.0
 * @author Kristian Rosenvold NOTE: This class is not part of any public api and can be changed or
 *         deleted without prior notice.
 */
public class BuildLogItem {
  private final ExecutionPlanItem executionPlanItem;

  private final MavenProject project;

  private final long startTime;

  private long endTime;

  private final List<DependencyLogEntry> dependencies = Collections
      .synchronizedList(new ArrayList<DependencyLogEntry>());

  public BuildLogItem(MavenProject project, ExecutionPlanItem executionPlanItem) {
    this.executionPlanItem = executionPlanItem;
    this.project = project;
    startTime = System.currentTimeMillis();

  }

  public MavenProject getProject() {
    return project;
  }

  public void setComplete() {
    endTime = System.currentTimeMillis();
  }

  public void addWait(MavenProject upstreamProject, ExecutionPlanItem inSchedule, long startWait) {
    long now = System.currentTimeMillis();
    dependencies.add(new DependencyLogEntry(upstreamProject, inSchedule, startWait, now, null));
  }

  public void addDependency(MavenProject upstreamProject, String message) {
    dependencies.add(new DependencyLogEntry(upstreamProject, message));
  }

  public String toString(long rootStart) {
    StringBuilder result = new StringBuilder();
    result.append(String.format("%1d  %2d ", startTime - rootStart, endTime - rootStart));
    result.append(project.getName());
    result.append(" ");
    result.append(getMojoExecutionDescription(executionPlanItem));
    if (dependencies.size() > 0) {
      result.append("\n");
      for (DependencyLogEntry waitLogEntry : dependencies) {
        result.append("    ");
        result.append(waitLogEntry.toString());
        result.append("\n");
      }
    }
    return result.toString();
  }

  public Object toGraph(long rootStart) {
    StringBuilder result = new StringBuilder();
    if (dependencies.size() > 0) {
      for (DependencyLogEntry waitLogEntry : dependencies) {
        result.append("        ");
        result.append(nodeKey(project, executionPlanItem));
        result.append(" ->   ");
        result.append(waitLogEntry.toNodeKey());
        result.append(waitLogEntry.toNodeDescription(rootStart));
        result.append("\n");
      }
    } else {
      result.append("        ");
      result.append(nodeKey(project, executionPlanItem));
      result.append("\n");
    }
    return result.toString();
  }

  private static String nodeKey(MavenProject mavenProject, ExecutionPlanItem executionPlanItem) {
    String key = mavenProject.getArtifactId();
    if (executionPlanItem != null) {
      key += "_" + getMojoExecutionDescription(executionPlanItem);
    }
    return key.replace(".", "_").replace(":", "_");
  }

  private static String getMojoExecutionDescription(ExecutionPlanItem executionPlanItem) {
    if (executionPlanItem.getMojoExecution() != null) {
      return executionPlanItem.getMojoExecution().getArtifactId() + getLifeCyclePhase(executionPlanItem);
    } else {
      return "";
    }
  }

  private static String getLifeCyclePhase(ExecutionPlanItem executionPlanItem) {
    return executionPlanItem.getLifecyclePhase() != null ? "[" + executionPlanItem.getLifecyclePhase() + "]" : "";
  }

  class DependencyLogEntry {
    private final ExecutionPlanItem executionPlanItem;

    private final MavenProject upstreamProject;

    private final Long start;

    private final Long stop;

    private final String message;

    DependencyLogEntry(MavenProject upstreamProject, ExecutionPlanItem executionPlanItem, Long start, Long stop, String message) {
      this.upstreamProject = upstreamProject;
      this.executionPlanItem = executionPlanItem;
      this.start = start;
      this.stop = stop;
      this.message = message;
    }

    DependencyLogEntry(MavenProject upstreamProject, String message) {
      this(upstreamProject, null, null, null, message);
    }

    public String toString() {
      return upstreamProject.getName() + ":" + getExecutionPlanItem() + getElapsed() + getMessage();
    }

    public String toNodeKey() {
      return nodeKey(upstreamProject, executionPlanItem);
    }

    public String toNodeDescription(long rootStart) {
      return "";
    }

    private String getMessage() {
      return message != null ? message : "";
    }

    private String getExecutionPlanItem() {
      if (executionPlanItem != null) {
        return getMojoExecutionDescription(executionPlanItem);
      } else {
        return "";
      }
    }

    private String getElapsed() {
      if (start != null && stop != null) {
        long elapsed = stop - start;
        return elapsed > 0 ? ", wait=" + elapsed : "";
      }
      return "";
    }
  }

}
